Building Collisions

According to American Bird Conservancy, an estimated 300 million to 1 billion birds die each year from colliding into glass from city skyscrapers to an individual's home. Clear glass, reflective glass, and vegetation placed within lobbies of buildings disorient birds and cause bird 'collisions' or 'strikes.' Day time and nighttime strikes both occur resulting in bird deaths or injuries.

Glass without any visual markers confuse birds and makes it seem that they can fly through the area.
This is a photo of the Baltimore Convention Center from the East Alcove. Photo by Lynne Parks

Reflective glass is also dangerous. It reflects the habitat making it difficult to perceive what is real and what is not.
Photo courtesy of American Bird Conservancy

The best way to prevent birds from colliding with glass is to add a visual marker every 2 inches horizontal and every 4 inches vertical. Studies by American Bird Conservancy have proved that this spacing is most effective in preventing bird collisions. Image by Fatal Light Awareness Program

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